Flesh out configurable hardware based LED blinking.

The hardware (MAC) LED blinking involves a few things:

* Selecting which GPIO pins map to the MAC "power" and "network" lines;
* Configuring the MAC LED state (associated, scanning, idle);
* Configuring the MAC LED blinking type and speed.

The AR5416 HAL configures the normal blinking setup - ie, blink rate based
on TX/RX throughput.  The default AR5212 HAL doesn't program in any
specific blinking type, but the default of 0 is the same.

This code introduces a few things:

* The hardware led override is configured via sysctl 'hardled';
* The MAC network and power LED GPIO lines can be set, or left at -1
  if needed.  This is intended to allow only one of the hardware MUX
  entries to be configured (eg for PCIe cards which only have one LED
  exposed.)

TODO:

* For AR2417, the software LED blinking involves software blinking the
  Network LED.  For the AR5416 and later, this can just be configured
  as a GPIO output line.  I'll chase that up with a subsequent commit.

* Add another software LED blink for "Link", separate from "activity",
  which blinks based on the association state.  This would make my
  D-Link DWA-552 have consistent and useful LED behaviour (as they're
  marked "Link" and "Activity."

* Don't expose the hardware LED override unless it's an AR5416 or later,
  as the previous generation hardware doesn't have this multiplexing
  setup.

1 files changed, 16 insertions, 0 deletions

diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c
index e4d7976..ae785b2 100644
--- a/sys/dev/ath/if_ath.c
+++ b/sys/dev/ath/if_ath.c
@@ -479,11 +479,27 @@ ath_attach(u_int16_t devid, struct ath_softc *sc)
 	/* Start DFS processing tasklet */
 	TASK_INIT(&sc->sc_dfstask, 0, ath_dfs_tasklet, sc);
 
+	/* Configure LED state */
 	sc->sc_blinking = 0;
 	sc->sc_ledstate = 1;
 	sc->sc_ledon = 0;			/* low true */
 	sc->sc_ledidle = (2700*hz)/1000;	/* 2.7sec */
 	callout_init(&sc->sc_ledtimer, CALLOUT_MPSAFE);
+
+	/*
+	 * Don't setup hardware-based blinking.
+	 *
+	 * Although some NICs may have this configured in the
+	 * default reset register values, the user may wish
+	 * to alter which pins have which function.
+	 *
+	 * The reference driver attaches the MAC network LED to GPIO1 and
+	 * the MAC power LED to GPIO2.  However, the DWA-552 cardbus
+	 * NIC has these reversed.
+	 */
+	sc->sc_hardled = (1 == 0);
+	sc->sc_led_net_pin = -1;
+	sc->sc_led_pwr_pin = -1;
 	/*
 	 * Auto-enable soft led processing for IBM cards and for
 	 * 5211 minipci cards.  Users can also manually enable/disable